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J. Biol. Chem., Vol. 277, Issue 22, 19243-19246, May 31, 2002
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From the Department of Biochemistry and Molecular
Biophysics, Washington University School of Medicine, St.
Louis, Missouri 63110
A method is introduced to identify amino acid
residues that dictate the functional diversity acquired during
evolution in a protein family. Using over 80 enzymes of the
chymotrypsin family, we demonstrate that the general organization of
the phylogenetic tree and its functional branch points are fully
accounted for by a limited number of residues that cluster around the
active site of the protein and define the contact region with the
P1-P4 residues of substrate.
To whom correspondence should be addressed: Dept. of Biochemistry
and Molecular Biophysics, Washington University School of Medicine, Box
8231, 660 S. Euclid Ave., St. Louis, MO 63110. Tel.: 314-362-4185; Fax:
314-747-5354; E-mail: enrico@biochem.wustl.edu.
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